Справочник Пользователя для Mitsubishi Electronics FX5

6  CLOCK FUNCTION

6.3  System clock

There are two types of system clocks, one is to execute ON/OFF by the system and the other is to execute ON/OFF in the 
intervals specified by the user.

Special relays used for system clock are as follows.

Special registers used for system clock are as follows.

SM420 to SM424, SM8330 to SM8334, and SD8330 to SD8334 are used by the DUTY instruction.
For the DUTY instruction, refer to the following. 
MELSEC iQ-F FX5 Programming Manual (Instructions, Standard Functions/Function Blocks)

SM400, SM8000

Always ON

SM401, SM8001

Always OFF

SM402, SM8002

After RUN, ON for one scan only

SM403, SM8003

After RUN, OFF for one scan only

SM409, SM8011

0.01 second clock

SM410, SM8012

0.1 second clock

SM411

0.2 second clock

SM412, SM8013

1 second clock

SM413

2 second clock

SM414

2n second clock

SM415

2n ms clock

SM8014

1 min clock

SM420, SM8330

Timing clock output 1

SM421, SM8331

Timing clock output 2

SM422, SM8332

Timing clock output 3

SM423, SM8333

Timing clock output 4

SM424, SM8334

Timing clock output 5

SD412

One second counter

SD414

2n second clock setting

SD415

2n ms clock setting

SD420

Scan counter

SD8330

Counted number of scans for timing clock output 1

SD8331

Counted number of scans for timing clock output 2

SD8332

Counted number of scans for timing clock output 3

SD8333

Counted number of scans for timing clock output 4

SD8334

Counted number of scans for timing clock output 5